Skiving machine



A. R. RIDDERsTRoM July 16, 1929.

SKIVING MACHINE Filed Feb. 2, 1922 PII.

Patented July 16, 1929.

I UNITED STATES 1,721,047 PATENT oFFiCE.

ANDREW R. RIDDERSTROM, OF

NAI-TANT MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO UNITED SHOEMACHINERY CORPORATION, OE PATERSON, NEW JERSEY, A CORPORATION OF NEW`JERSEY.

SKIVING Application filed February The present invention relates toskiving machines, andmore particularly to machines of the Amazeen typefor skiving the margins of shectmaterial, like leather shoe uppers orother stock adapted for use in the manufaa ture of boots and shoes, butembodies features of more general aj'iplication the nature of which willappear in the course of the following` description and will beparticularly pointed out in the claims.

Different margins of the same shoe upper are frequently provided withscarfs of di tier cnt angle. It' it is desired to fold the skivedmargin, the scarf is usually made comparatively shallow, and terminatesusually in aL feather edge. lf, however, the margin is to be leftunfolded, it is preferred to have the scarf verjY sharp, and terminatingin a blunt shoulder at the edge of the upper. If unprovided with ashoulder of this character. the unfolded margin, if on the inside of theshoe, will curl and cause annoyance to the wearer-s foot. This isparticularly true of shoes the uppers of which are constituted of aplurality of leather pieces sewed together, the margins exposed on theoutside of the shoe being folded, and those on the inside, unfolded; thefolded margins being provided with wide, shallow, slanted scarfs, andthe unfolded margins with narrow scarfs of sharp angle.

S'o far as known, all Amazeen skiving machines have heretofore been soconstructed as to render it impossible to change materially the relativepositions of the skiving knife and the feed roll during` the operationof the machine. To skive scarfs of different angle with machines of thistype, therefore, it is necessary: first, to run the leather through themachine to produce a scarf of one angle;

then stop the machine for the purpose of efl fecting some necessaryadjustment; and finally, to run the leather through the niachine` asadjusted. to produce a scarf of different angle in another portion ofthe margin. This procedure is, of course, wasteful of time, and thenecessary frequent adjustments are, fiufthermore. very troublesome. Ithas, therefore., been customary to employ a plurality of machines, eachadjusted to cut a scarf of a particular, desired angle. The

uppers are all first run through one machine to produce one scarf in oneportion of the margin, and then through another machine MACHINE.

2, 1922. Serial No. 533,644.

to produce another scarf in another portion of the margin. Though thispractice saves some timeand avoids troublesome adjustments, it is stillobjectionable. Various plans have, therefore, been proposed to improveupon this primitive method of procedure. A machine has been constructed,for example, that is provided with two separateand distinct, differentlyadjusted, skiving instru! mentalities conveniently supported upon asingle frame, so that the operator vmayv proceed directly from the oneinstrumentality to the other while still holding the upper in' hishands. This does save further time, but the machine is really twomachies, and not one. Again, it has been suggested to use a pluralitylof gages upon the same machine in order that one margin of the uppermay bc guided by one gage and another by another, the gages being soarranged as to enable the machine to skive scarfs of different width.This suggestion does not, however, provide for scarfs of differentangle, and the suggester machine is, furthermore, somewhat complex. F orone reason or another, the various proposed improvements have not metwith commercial favor, so that the more primitivemethod above describedof employing a plurality of separatemachines is still the standard inthe shoe factor.

In the machine of a copending application Serial No. 319,565, filedAugust 25, 1919, of which the present applicationis a continuation inpart, provision is made for relatively adjusting, at will, the angularpositions of the skiving knife and the feed roll, during the operationof the machine, to a substantial extent sufficient to meet commercialneeds, so that the operator, after skiving a scarf of one angle in aportion of the margin of the leather, is enabled quickly to change theangular relation ofthe knife and the feed roll. Scarfs of differentangle may thus be quickly produced in different portions of the marginof the same shoe upper'.

, Relative adjustment of the skiving knife and the feed roll is not, ofCourse, new; but such adjustment has heretofore usually in volved theuse of tools, and so could not be effected duringthe operation of themachine. Nor is'it new to effect such adjustment manually, without theaid of tools; provision for contemplated very small clianges,sueh as arenecessary to compensate for wear of the knife by grinding. It hasfurthermore been proposed to effect slight treadle-contrOlled movementof the feed roll for the purpose of varying the character of the edge ofthe scarf, but this proposal was not intended to effect the angle of thescarf.

ri"he chief object of the present invention is to provide an improvedmachine of the abovedescribed character that shall afford quick relativeangular adjustment between the knife and the feed means of sufficientlylarge angular extent to effect the skiving of wide and sharp scarfs inthe margin of the shoe upper during the operation of the machine.

llfith this end in view, the invention consists of the improvedmachinepreferred embodiment of which is hereinafter described, illustrated inthe accompanying` drawings, and defined in the appended claims.

In the accompanying drawings, Fig. 1 is a fragmentary elevation of apreferred machine constructed in accordance with the present invention,parts being omitted for clearness; and Fig. 2 is a corresponding planview of the same.

The skiving machine of the present invention is provided with acontinuously ro tating, disk skiving` knife 185 to which a shoe upper orother stock is advanced by a feed roll 95, which may be longitmlinallyvand vertically adjustable, and a feed disk 1&3, which may betransversely adjustable. The feed disk and the knife are carried by anoverhanging arm 22 of the frame 2O of the machine. The feed rollprojects forwardly, as shown, beyond the base portion 21 of the frame.The knife is driven direct from a pulley 4 by a belt (not shown), andlthe feed roll and the feed disk are driven from the knife, as isdescribed more particularly in acopending application, Serial No.521,239, filed December 9, 1921. The particular driving mechanism willnot befurther mentioned herein, since it forms no part of the presentinvention, and other and well known driving mechanisms may besubstituted therefor without affecting` the invention in any way. Thecustomary is omitted from the drawings for clearness.

The knife and the feed roll are relatively adjustable to skive either awide, slanting scarf or a narrow, sharp scarf, as is illustrated anddescribed more particularly in a copending application, Serial No.510,710, filed Oct. 27, 1921. To this end, the knifecarrying bracket 170is angularly adjustable about a rod 16st, being provided with oppositelydisposed bearings within which the rod 164 is journaled. Thelniife-carrying bracket is also adjustable transversely of the feed roll95 by means including a plunger 17 6, but this not further describedherein, be-

cause the specific transverse adjusting means is not an essential partof the present invention. A further description thereof may be found inthe above-described application, Serial No. 319,565. A finger or lug 188that projects from the knife bracket is yielding ly engaged by a dog 17through the action of a spring189 seated in the frame. The spring thustends to maintain the lug 188 in engagement with an arm 190. Byactuating the arm 19t), therefore, in opposition to 'the action of thespring 189, the angular position of the knife bracket 179 and the knife185 that is mounted thereon may be adjusted.

The arm 190 is actuated by a treadle (not shown), through a treadle .rod191, about the rod 1fi-1t,.to which it is intermcdiately pivoted at 193.The arm 199 provided with adjust-- able stops, shown as threadedlyadjustable screws 318 and 329, adapted, respectively, to engage lugs andthat are provided upon the frame. rl`he degree of angular movement ofthe arm 190 and, therefore, of the knife 185, may thus be adjustablylimited. lvfovement of the knife in one direction may be effected byactuation of the treadle rod 191. ivfovement in the opposite direction,upon release of the treadle (not shown) is effected by the spring 189.The knife adjustment may be effected during the operation of the machinewithout affecting the operation of either the knife or the feed means.The spring 189 and the driving belt (not. shown) for the knife-drivingpulley i exert a force upon the knife shaft in the same angulardirection, each acting to maintain the stop 320 in engagement with thelug 324;. rlhe normal operating position of the knife 185 may thereforebe adjustably determined by the stop 320.

As the rod 1611 about which the knife pivots .is out of line with thecutting edge of the knife, the knife moves both angularly and bodily, inresponse to the operation of the treadle rod 191, and to a greater orlesser extent, as desired, at the will of the operator, so that scarit'sof one angle may be provided with a feather edge, and scarfs of anotherangle with a blunt edge.

rlhe description of many portions of the machine an understandingl ofwhich is not essential to an understanding of the present invention haspurposely been omitted, and many parts of the machine have purposely notbeen illustrated, in order not to distract the attention from thefeatures of the essential novelty. liuller explanation of such portionsof the machine will be found in the copending applications referred toabove. 1t will be Iclear that the features of novelty may be embodied inother machines, and in machines of other types, and that modificationsmay be made therein by persons skilled in the art, without departing`from the spirit and scope of the invention, as defined in tue appendedclaims, Y

What is claimed as new is:

1. A skiving machine having, in combination, a continuously operatingknife for skiving the margin of sheet material, means for operating theknife, means for feedingl the material to the knife, and-treadle-controlled means operable during the operation of the machine for quicklymoving the knife angularly to a substantial extent without interferingwith the operation of the` knife t0 eflectthe skiving of scarfs ofdifferent angle inthe margin of the material.

2. A skiving machine having, in combination, a knife for skiving themargin of sheet material, means for operating the knife, a rotatablefeed roll for feeding the material to the knife, and treadle-controlledmeans operable during the operation of the machine for quickly movingthe knife angularly to a substantial extent without interfering witht-he operation of the knife to effect the skiving of scarfs of differentangle in the margin of the material.

3. A ski ving machine having, in combination, a frame, a rotatable knifefor skivingl the margin of sheet material, a feed roll and a feed diskfor feeding material to the knife, and a treadle-controlled arm operableduring the operation of the machine for angie larly moving the knife,Without interfering with the operation of the knife and the feed roll,to effect the skiving of scarfs of dif ferent angle in the margin of thematerial, the arm heilig provided with adjustable stops each adapted toengage the frame to adjustably control the limits of movement of theknife.

4l. A machine of the character described having, in combination, aframe, a rod mounted in the frame, a knife frame journaled on the rodhaving a lug, a knife mounted on the knife frame for skiving the marginof sheet material, means for operating the knife, means for feeding thematerial to the knife, a spring acting upon the lug to maintain theknife in a normal position, and a treadle-controlled arm for engagingthe lug to quickly adjust the position ofthe knife angularly to asubstantial extent Without interfering with the operation of the knifeto effect the ski ving of scarfs of different angle in the margin of thematerial.

5. A skiving machine having, in combination, a knife for skiving themargin of sheet material, means for feeding the material to the knife,the knife and the feed means being relatively freely movable angularlyto a substantial extent at all times during the operation of themachine, means op erable during the Operation of the machine for quicklyrelatively moving angular-ly, between limits, the knife and the feedmeans, without interfering with the operation of the knife or the feedmeans, to a sufficiently large angular` extent to provide for effectingthe skiving of wide slanting and narrow steep soarfs of differentanglein the margin of the sheet material, and means for adjusting the saidlimits.

G. A skiving machine having, in combination, a knife for skiving themargin of sheet material, a feed roll forfeeding the material to theknife, means for rotating the feed roll, the knife and the feed rollbeing relatively freely movable angularly to a substantial extent at alltimes during the operation of the macliine, means operable during theoperation of the machine for quickly relatively n'ioving angularly, theknife and the feed roll, without interfering with the operation of theknife or the rotation of the feed roll, to a sufficiently largeangulaieXtent to provide for effecting the sk'ving of Wide slanting andarrow steep scarfs of different angle in the margin of the material, andmeans for adjustably limiting the relative angular movement of the knifeand the feed roll.

7. A skiving machine having, in combination, a knife for skiving themargin of sheet material, means for feeding the material to the knife,the knife and the feed means being relatively freely movableangularly toa substantial extent at all times during the operation of the machine, amanually controlled arm operable during the operation of the machine forquickly relatively moving the knife and the feed means angularly,without interfering with the rotation of the knife or the operation ofthe feed means, to a sutliciently large angular extent to provide foreffecting the skiving of wide slanting and narrow steep scarfs ofdifferent angle in the margin of the material, and adjustable meansadapted to engage the arm to adjustably limit the relative angularmovement of the knife and the feed means.

8. A skiving machine having, in combination, a rotatable disk knife forskiving the margin of sheet material, means for rotating the knife,means comprising a feed roll anda feed disk for feeding material to theknife, the knife and the feed means being relatively freely movableangularly to a substantial eX- tent at all times during the operation ofthe machine, and means operable during the operation of the machine forquickly relatively moving the knife and the feed means angularly,without interfering with the rotation of the-knife or the feed roll orthe feed disk, to a sufficiently large angular extent to provide foreffecting the skiving of wide slanting and narrow steep scarfs ofdifferent angle in the margin of the material.

9. A skiving machine having, in combination, a rotatable knife for skiving the margin of sheet material, means for rotating the knife, meansfor feeding the material lto the knife, the knife being freely movableangularly to' a substantial extent at all times during the operation ofthe machine, and means operable during the operation of the machine forquickly moving the knife angularly, Without interfering with therotation of the knife, to a sufficiently large angular extent to providefor effecting the skiving of Wide slanting and narrow steep scarfs ofdifferent angle in the margin of the material.

10. A skiying machine having, in combination, a rotatable disk knife forskiving the margin of sheet material, means for rotating the knife,means comprising` a feed roll and a feed disk for feeding the materialto the knife, the knife beingfreely movable angular-ly to a substantialextent at all times during the operation of the machine, andtreadlecmitrolled means operable during the operation of the machine forquickly moving the knife an gnlarly, without interfering` with therotation of the knife or the feed roll or the feed disk, to asufiiciently large angular eX- tent to provide for effecting the skivingof wide slanting and narrow steep scarfs of different angle in themargin of the material. y

ll. A skiving machine haring, in combination, a rotatable disk knife forskiving thev margin of sheet material, means for rotating the knife,means comprising a feed roll and a feed disk for feeding the material tothe knife, the knife and the feed means being rela-tively freely'movable angularly to a substantial extent at all times during theoperation of the machine, and treadle-controlled means operable duringthe operation of the machine for quickly relatively moving the knife andthe feed means angularly, without interfering with the rotaiiion oftheknife or 'the fed roll or the feed disk, to a sufficiently large angularextent to provide for effecting the skiring of wide slanting and narrowsteep scarfs of different angle in the margin of the material.

In testimony whereof, I have hereunto subscribed my name this 31st dayof January, 1922.

ANDREXV R. RIDDERSTROM.

